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* Generic parallel printer driver
*
* Copyright (C) 1992 by Jim Weigand and Linus Torvalds
* Copyright (C) 1992,1993 by Michael K. Johnson
* - Thanks much to Gunter Windau for pointing out to me where the error
* checking ought to be.
* Copyright (C) 1993 by Nigel Gamble (added interrupt code)
* Copyright (C) 1994 by Alan Cox (Modularised it)
* LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
* Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
* "lp=" command line parameters added by Grant Guenther, grant@torque.net
* lp_read (Status readback) support added by Carsten Gross,
* carsten@sol.wohnheim.uni-ulm.de
* Support for parport by Philip Blundell <Philip.Blundell@pobox.com>
* Parport sharing hacking by Andrea Arcangeli
* Fixed kernel_(to/from)_user memory copy to check for errors
* by Riccardo Facchetti <fizban@tin.it>
* Redesigned interrupt handling for handle printers with buggy handshake
* by Andrea Arcangeli, 11 May 1998
* Full efficient handling of printer with buggy irq handshake (now I have
* understood the meaning of the strange handshake). This is done sending new
* characters if the interrupt is just happened, even if the printer say to
* be still BUSY. This is needed at least with Epson Stylus Color. To enable
* the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
* Fixed the irq on the rising edge of the strobe case.
* Obsoleted the CAREFUL flag since a printer that doesn' t work with
* CAREFUL will block a bit after in lp_check_status().
* Andrea Arcangeli, 15 Oct 1998
*/
/* This driver should, in theory, work with any parallel port that has an
* appropriate low-level driver; all I/O is done through the parport
* abstraction layer.
*
* If this driver is built into the kernel, you can configure it using the
* kernel command-line. For example:
*
* lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
* bind lp2 to parport2)
*
* lp=auto (assign lp devices to all ports that
* have printers attached, as determined
* by the IEEE-1284 autoprobe)
*
* lp=reset (reset the printer during
* initialisation)
*
* lp=off (disable the printer driver entirely)
*
* If the driver is loaded as a module, similar functionality is available
* using module parameters. The equivalent of the above commands would be:
*
* # insmod lp.o parport=1,none,2
*
* # insmod lp.o parport=auto
*
* # insmod lp.o reset=1
*/
/*
* LP OPTIMIZATIONS
*
* - TRUST_IRQ flag
*
* Epson Stylus Color, HP and many other new printers want the TRUST_IRQ flag
* set when printing with interrupts. This is a long story. Such printers
* use a broken handshake (see the timing graph below) when printing with
* interrupts. The lp driver as default is just able to handle such bogus
* handshake, but setting such flag cause lp to go faster and probably do
* what such printers want (even if not documented).
*
* NOTE that setting the TRUST_IRQ flag in some printer can cause the irq
* printing to fail completly. You must try, to know if your printer
* will handle it. I suggest a graphics printing to force a major flow of
* characters to the printer for do the test. NOTE also that the TRUST_IRQ
* flag _should_ be fine everywhere but there is a lot of buggy hardware out
* there, so I am forced to implement it as a not-default thing.
* WARNING: before to do the test, be sure to have not played with the
* `-w' parameter of tunelp!
*
* Note also that lp automagically warn you (with a KERN_WARNING) if it
* detects that you could _try_ to set the TRUST_IRQ flag to speed up the
* printing and decrease the CPU load.
*
* To set the TRUST_IRQ flag you can use this command:
*
* tunelp /dev/lp? -T on
*
* If you have an old tunelp executable you can (hack and) use this simple
* C lazy proggy to set the flag in the lp driver:
-------------------------- cut here -------------------------------------
#include <fcntl.h>
#include <sys/ioctl.h>
#define LPTRUSTIRQ 0x060f
int main(int argc, char **argv)
{
int fd = open("/dev/lp0", O_RDONLY);
ioctl(fd, LPTRUSTIRQ, argc - 1);
if (argc - 1)
printf("trusting the irq\n");
else
printf("untrusting the irq\n");
return 0;
}
-------------------------- cut here -------------------------------------
* - LP_WAIT time
*
* You can use this setting if your printer is fast enough and/or your
* machine is slow enough ;-).
*
* tunelp /dev/lp? -w 0
*
* - LP_CHAR tries
*
* If you print with irqs probably you can decrease the CPU load a lot using
* this setting. This is not the default because the printing is reported to
* be jerky somewhere...
*
* tunelp /dev/lp? -c 1
*
* 11 Nov 1998, Andrea Arcangeli
*/
/* COMPATIBILITY WITH OLD KERNELS
*
* Under Linux 2.0 and previous versions, lp devices were bound to ports at
* particular I/O addresses, as follows:
*
* lp0 0x3bc
* lp1 0x378
* lp2 0x278
*
* The new driver, by default, binds lp devices to parport devices as it
* finds them. This means that if you only have one port, it will be bound
* to lp0 regardless of its I/O address. If you need the old behaviour, you
* can force it using the parameters described above.
*/
/*
* The new interrupt handling code take care of the buggy handshake
* of some HP and Epson printer:
* ___
* ACK _______________ ___________
* |__|
* ____
* BUSY _________ _______
* |____________|
*
* I discovered this using the printer scanner that you can find at:
*
* ftp://e-mind.com/pub/linux/pscan/
*
* 11 May 98, Andrea Arcangeli
*
* My printer scanner run on an Epson Stylus Color show that such printer
* generates the irq on the _rising_ edge of the STROBE. Now lp handle
* this case fine too.
*
* 15 Oct 1998, Andrea Arcangeli
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/parport.h>
#undef LP_STATS
#include <linux/lp.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/system.h>
/* if you have more than 3 printers, remember to increase LP_NO */
#define LP_NO 3
struct lp_struct lp_table[LP_NO] =
{
[0 ... LP_NO-1] = {NULL, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT,
NULL,
#ifdef LP_STATS
0, 0, {0},
#endif
NULL, 0, 0, 0}
};
/* Test if printer is ready */
#define LP_READY(status) ((status) & LP_PBUSY)
/* Test if the printer is not acking the strobe */
#define LP_NO_ACKING(status) ((status) & LP_PACK)
/* Test if the printer has error conditions */
#define LP_NO_ERROR(status) ((status) & LP_PERRORP)
#undef LP_DEBUG
#undef LP_READ_DEBUG
/* --- parport support ----------------------------------------- */
static int lp_preempt(void *handle)
{
struct lp_struct *lps = (struct lp_struct *)handle;
if (waitqueue_active (&lps->wait_q))
wake_up_interruptible(&lps->wait_q);
/* Don't actually release the port now */
return 1;
}
#define lp_parport_release(x) do { parport_release(lp_table[(x)].dev); } while (0);
#define lp_parport_claim(x) do { parport_claim_or_block(lp_table[(x)].dev); } while (0);
/* --- low-level port access ----------------------------------- */
#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
static __inline__ void lp_yield (int minor)
{
if (!parport_yield_blocking (lp_table[minor].dev))
{
if (current->need_resched)
schedule ();
} else
lp_table[minor].irq_missed = 1;
}
static __inline__ void lp_schedule(int minor, long timeout)
{
struct pardevice *dev = lp_table[minor].dev;
register unsigned long int timeslip = (jiffies - dev->time);
if ((timeslip > dev->timeslice) && (dev->port->waithead != NULL)) {
lp_parport_release(minor);
lp_table[minor].irq_missed = 1;
schedule_timeout(timeout);
lp_parport_claim(minor);
}
else
schedule_timeout(timeout);
}
static int lp_reset(int minor)
{
int retval;
lp_parport_claim (minor);
w_ctr(minor, LP_PSELECP);
udelay (LP_DELAY);
w_ctr(minor, LP_PSELECP | LP_PINITP);
retval = r_str(minor);
lp_parport_release (minor);
return retval;
}
#define lp_wait(minor) udelay(LP_WAIT(minor))
static inline int lp_char(char lpchar, int minor)
{
unsigned long count = 0;
#ifdef LP_STATS
struct lp_stats *stats;
#endif
if (signal_pending(current))
return 0;
for (;;)
{
unsigned char status;
int irq_ok = 0;
/*
* Give a chance to other pardevice to run in the meantime.
*/
lp_yield(minor);
status = r_str(minor);
if (LP_NO_ERROR(status))
{
if (LP_READY(status))
break;
/*
* This is a crude hack that should be well known
* at least by Epson device driver developers. -arca
*/
irq_ok = (!LP_POLLED(minor) &&
LP_NO_ACKING(status) &&
lp_table[minor].irq_detected);
if ((LP_F(minor) & LP_TRUST_IRQ) && irq_ok)
break;
}
/*
* NOTE: if you run with irqs you _must_ use
* `tunelp /dev/lp? -c 1' to be rasonable efficient!
*/
if (++count == LP_CHAR(minor))
{
if (irq_ok)
{
static int first_time = 1;
/*
* The printer is using a buggy handshake, so
* revert to polling to not overload the
* machine and warn the user that its printer
* could get optimized trusting the irq. -arca
*/
lp_table[minor].irq_missed = 1;
if (first_time)
{
first_time = 0;
printk(KERN_WARNING "lp%d: the "
"printing could be optimized "
"using the TRUST_IRQ flag, "
"see the top of "
"linux/drivers/char/lp.c\n",
minor);
}
}
return 0;
}
}
w_dtr(minor, lpchar);
#ifdef LP_STATS
stats = &LP_STAT(minor);
stats->chars++;
#endif
/* must wait before taking strobe high, and after taking strobe
low, according spec. Some printers need it, others don't. */
lp_wait(minor);
/* control port takes strobe high */
if (LP_POLLED(minor))
{
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PSTROBE);
lp_wait(minor);
w_ctr(minor, LP_PSELECP | LP_PINITP);
} else {
/*
* Epson Stylus Color generate the IRQ on the rising edge of
* strobe so clean the irq's information before playing with
* the strobe. -arca
*/
lp_table[minor].irq_detected = 0;
lp_table[minor].irq_missed = 0;
/*
* Be sure that the CPU doesn' t reorder instructions. -arca
*/
mb();
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PSTROBE | LP_PINTEN);
lp_wait(minor);
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PINTEN);
}
/*
* Give to the printer a chance to put BUSY low. Really we could
* remove this because we could _guess_ that we are slower to reach
* again lp_char() than the printer to put BUSY low, but I' d like
* to remove this variable from the function I go solve
* when I read bug reports ;-). -arca
*/
lp_wait(minor);
#ifdef LP_STATS
/* update waittime statistics */
if (count > stats->maxwait) {
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d success after %d counts.\n",
minor, count);
#endif
stats->maxwait = count;
}
count *= 256;
wait = (count > stats->meanwait) ? count - stats->meanwait :
stats->meanwait - count;
stats->meanwait = (255 * stats->meanwait + count + 128) / 256;
stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
#endif
return 1;
}
static void lp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct lp_struct *lp_dev = (struct lp_struct *) dev_id;
if (waitqueue_active (&lp_dev->wait_q))
wake_up_interruptible(&lp_dev->wait_q);
lp_dev->irq_detected = 1;
lp_dev->irq_missed = 0;
}
static void lp_error(int minor)
{
if (LP_POLLED(minor) || LP_PREEMPTED(minor)) {
current->state = TASK_INTERRUPTIBLE;
lp_parport_release(minor);
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(LP_TIMEOUT_POLLED);
lp_parport_claim(minor);
lp_table[minor].irq_missed = 1;
}
}
static int lp_check_status(int minor)
{
unsigned int last = lp_table[minor].last_error;
unsigned char status = r_str(minor);
if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
/* No error. */
last = 0;
else if ((status & LP_POUTPA)) {
if (last != LP_POUTPA) {
last = LP_POUTPA;
printk(KERN_INFO "lp%d out of paper\n", minor);
}
} else if (!(status & LP_PSELECD)) {
if (last != LP_PSELECD) {
last = LP_PSELECD;
printk(KERN_INFO "lp%d off-line\n", minor);
}
} else if (!(status & LP_PERRORP)) {
if (last != LP_PERRORP) {
last = LP_PERRORP;
printk(KERN_INFO "lp%d on fire\n", minor);
}
} else {
last = 0; /* Come here if LP_CAREFUL is set and no
errors are reported. */
}
lp_table[minor].last_error = last;
if (last != 0) {
if (LP_F(minor) & LP_ABORT)
return 1;
lp_error(minor);
}
return 0;
}
static int lp_write_buf(unsigned int minor, const char *buf, int count)
{
unsigned long copy_size;
unsigned long total_bytes_written = 0;
unsigned long bytes_written;
struct lp_struct *lp = &lp_table[minor];
if (minor >= LP_NO)
return -ENXIO;
if (lp->dev == NULL)
return -ENXIO;
lp_table[minor].last_error = 0;
lp_table[minor].irq_detected = 0;
lp_table[minor].irq_missed = 1;
if (LP_POLLED(minor))
w_ctr(minor, LP_PSELECP | LP_PINITP);
else
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PINTEN);
do {
bytes_written = 0;
copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
if (copy_from_user(lp->lp_buffer, buf, copy_size))
{
w_ctr(minor, LP_PSELECP | LP_PINITP);
return -EFAULT;
}
while (copy_size) {
if (lp_char(lp->lp_buffer[bytes_written], minor)) {
--copy_size;
++bytes_written;
#ifdef LP_STATS
lp->runchars++;
#endif
} else {
int rc = total_bytes_written + bytes_written;
#ifdef LP_STATS
if (lp->runchars > LP_STAT(minor).maxrun)
LP_STAT(minor).maxrun = lp->runchars;
LP_STAT(minor).sleeps++;
#endif
if (signal_pending(current))
{
w_ctr(minor, LP_PSELECP | LP_PINITP);
if (total_bytes_written + bytes_written)
return total_bytes_written + bytes_written;
else
return -EINTR;
}
#ifdef LP_STATS
lp->runchars = 0;
#endif
if (lp_check_status(minor))
{
w_ctr(minor, LP_PSELECP | LP_PINITP);
return rc ? rc : -EIO;
}
if (LP_POLLED(minor) ||
lp_table[minor].irq_missed)
{
lp_polling:
#if defined(LP_DEBUG) && defined(LP_STATS)
printk(KERN_DEBUG "lp%d sleeping at %d characters for %d jiffies\n", minor, lp->runchars, LP_TIME(minor));
#endif
current->state = TASK_INTERRUPTIBLE;
lp_schedule(minor, LP_TIME(minor));
} else {
cli();
if (LP_PREEMPTED(minor))
{
/*
* We can' t sleep on the interrupt
* since another pardevice need the port.
* We must check this in a cli() protected
* envinroment to avoid parport sharing
* starvation.
*/
sti();
goto lp_polling;
}
if (!lp_table[minor].irq_detected)
interruptible_sleep_on_timeout(&lp->wait_q, LP_TIMEOUT_INTERRUPT);
sti();
}
}
}
total_bytes_written += bytes_written;
buf += bytes_written;
count -= bytes_written;
} while (count > 0);
w_ctr(minor, LP_PSELECP | LP_PINITP);
return total_bytes_written;
}
static ssize_t lp_write(struct file * file, const char * buf,
size_t count, loff_t *ppos)
{
unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
ssize_t retv;
#ifdef LP_STATS
if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
lp_table[minor].runchars = 0;
lp_table[minor].lastcall = jiffies;
#endif
/* Claim Parport or sleep until it becomes available
*/
lp_parport_claim (minor);
retv = lp_write_buf(minor, buf, count);
lp_parport_release (minor);
return retv;
}
static long long lp_lseek(struct file * file, long long offset, int origin)
{
return -ESPIPE;
}
#ifdef CONFIG_PRINTER_READBACK
static int lp_read_nibble(int minor)
{
unsigned char i;
i = r_str(minor)>>3;
i &= ~8;
if ((i & 0x10) == 0) i |= 8;
return (i & 0x0f);
}
static void lp_read_terminate(struct parport *port) {
parport_write_control(port, (parport_read_control(port) & ~2) | 8);
/* SelectIN high, AutoFeed low */
if (parport_wait_peripheral(port, 0x80, 0))
/* timeout, SelectIN high, Autofeed low */
return;
parport_write_control(port, parport_read_control(port) | 2);
/* AutoFeed high */
parport_wait_peripheral(port, 0x80, 0x80);
/* no timeout possible, Autofeed low, SelectIN high */
parport_write_control(port, (parport_read_control(port) & ~2) | 8);
}
/* Status readback confirming to ieee1284 */
static ssize_t lp_read(struct file * file, char * buf,
size_t length, loff_t *ppos)
{
int i;
unsigned int minor=MINOR(file->f_dentry->d_inode->i_rdev);
char *temp = buf;
ssize_t count = 0;
unsigned char z = 0;
unsigned char Byte = 0;
struct parport *port = lp_table[minor].dev->port;
lp_parport_claim (minor);
switch (parport_ieee1284_nibble_mode_ok(port, 0))
{
case 0:
/* Handshake failed. */
lp_read_terminate(port);
lp_parport_release (minor);
return -EIO;
case 1:
/* No data. */
lp_read_terminate(port);
lp_parport_release (minor);
return 0;
default:
/* Data available. */
/* Hack: Wait 10ms (between events 6 and 7) */
current->state = TASK_INTERRUPTIBLE;
schedule_timeout((HZ+99)/100);
break;
}
for (i=0; ; i++) {
parport_frob_control(port, 2, 2); /* AutoFeed high */
if (parport_wait_peripheral(port, 0x40, 0)) {
#ifdef LP_READ_DEBUG
/* Some peripherals just time out when they've sent
all their data. */
printk("%s: read1 timeout.\n", port->name);
#endif
parport_frob_control(port, 2, 0); /* AutoFeed low */
break;
}
z = lp_read_nibble(minor);
parport_frob_control(port, 2, 0); /* AutoFeed low */
if (parport_wait_peripheral(port, 0x40, 0x40)) {
printk("%s: read2 timeout.\n", port->name);
break;
}
if ((i & 1) != 0) {
Byte |= (z<<4);
if (__put_user (Byte, temp))
{
count = -EFAULT;
break;
} else {
temp++;
if (++count == length)
break;
}
/* Does the error line indicate end of data? */
if ((parport_read_status(port) & LP_PERRORP) ==
LP_PERRORP)
break;
} else
Byte=z;
}
lp_read_terminate(port);
lp_parport_release (minor);
return count;
}
#endif
static int lp_open(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
if (minor >= LP_NO)
return -ENXIO;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENXIO;
if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
return -EBUSY;
MOD_INC_USE_COUNT;
/* If ABORTOPEN is set and the printer is offline or out of paper,
we may still want to open it to perform ioctl()s. Therefore we
have commandeered O_NONBLOCK, even though it is being used in
a non-standard manner. This is strictly a Linux hack, and
should most likely only ever be used by the tunelp application. */
if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
int status;
lp_parport_claim (minor);
status = r_str(minor);
lp_parport_release (minor);
if (status & LP_POUTPA) {
printk(KERN_INFO "lp%d out of paper\n", minor);
MOD_DEC_USE_COUNT;
LP_F(minor) &= ~LP_BUSY;
return -ENOSPC;
} else if (!(status & LP_PSELECD)) {
printk(KERN_INFO "lp%d off-line\n", minor);
MOD_DEC_USE_COUNT;
LP_F(minor) &= ~LP_BUSY;
return -EIO;
} else if (!(status & LP_PERRORP)) {
printk(KERN_ERR "lp%d printer error\n", minor);
MOD_DEC_USE_COUNT;
LP_F(minor) &= ~LP_BUSY;
return -EIO;
}
}
lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
if (!lp_table[minor].lp_buffer) {
MOD_DEC_USE_COUNT;
LP_F(minor) &= ~LP_BUSY;
return -ENOMEM;
}
return 0;
}
static int lp_release(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
lp_table[minor].lp_buffer = NULL;
MOD_DEC_USE_COUNT;
LP_F(minor) &= ~LP_BUSY;
return 0;
}
static int lp_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned int minor = MINOR(inode->i_rdev);
int status;
int retval = 0;
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
#endif
if (minor >= LP_NO)
return -ENODEV;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENODEV;
switch ( cmd ) {
case LPTIME:
LP_TIME(minor) = arg * HZ/100;
break;
case LPCHAR:
LP_CHAR(minor) = arg;
break;
case LPABORT:
if (arg)
LP_F(minor) |= LP_ABORT;
else
LP_F(minor) &= ~LP_ABORT;
break;
case LPABORTOPEN:
if (arg)
LP_F(minor) |= LP_ABORTOPEN;
else
LP_F(minor) &= ~LP_ABORTOPEN;
break;
case LPCAREFUL:
if (arg)
LP_F(minor) |= LP_CAREFUL;
else
LP_F(minor) &= ~LP_CAREFUL;
break;
case LPTRUSTIRQ:
if (arg)
LP_F(minor) |= LP_TRUST_IRQ;
else
LP_F(minor) &= ~LP_TRUST_IRQ;
break;
case LPWAIT:
LP_WAIT(minor) = arg;
break;
case LPSETIRQ:
return -EINVAL;
break;
case LPGETIRQ:
if (copy_to_user((int *) arg, &LP_IRQ(minor),
sizeof(int)))
return -EFAULT;
break;
case LPGETSTATUS:
lp_parport_claim(minor);
status = r_str(minor);
lp_parport_release(minor);
if (copy_to_user((int *) arg, &status, sizeof(int)))
return -EFAULT;
break;
case LPRESET:
lp_reset(minor);
break;
#ifdef LP_STATS
case LPGETSTATS:
if (copy_to_user((int *) arg, &LP_STAT(minor),
sizeof(struct lp_stats)))
return -EFAULT;
if (suser())
memset(&LP_STAT(minor), 0,
sizeof(struct lp_stats));
break;
#endif
case LPGETFLAGS:
status = LP_F(minor);
if (copy_to_user((int *) arg, &status, sizeof(int)))
return -EFAULT;
break;
default:
retval = -EINVAL;
}
return retval;
}
static struct file_operations lp_fops = {
lp_lseek,
#ifdef CONFIG_PRINTER_READBACK
lp_read,
#else
NULL,
#endif
lp_write,
NULL, /* lp_readdir */
NULL, /* lp_poll */
lp_ioctl,
NULL, /* lp_mmap */
lp_open,
NULL, /* flush */
lp_release
};
/* --- initialisation code ------------------------------------- */
#ifdef MODULE
static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
static char *parport[LP_NO] = { NULL, };
static int reset = 0;
MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
MODULE_PARM(reset, "i");
#else
static int parport_nr[LP_NO] __initdata = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
static int reset __initdata = 0;
static int parport_ptr = 0;
__initfunc(void lp_setup(char *str, int *ints))
{
if (!str) {
if (ints[0] == 0 || ints[1] == 0) {
/* disable driver on "lp=" or "lp=0" */
parport_nr[0] = LP_PARPORT_OFF;
} else {
printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", ints[1]);
}
} else if (!strncmp(str, "parport", 7)) {
int n = simple_strtoul(str+7, NULL, 10);
if (parport_ptr < LP_NO)
parport_nr[parport_ptr++] = n;
else
printk(KERN_INFO "lp: too many ports, %s ignored.\n",
str);
} else if (!strcmp(str, "auto")) {
parport_nr[0] = LP_PARPORT_AUTO;
} else if (!strcmp(str, "none")) {
parport_nr[parport_ptr++] = LP_PARPORT_NONE;
} else if (!strcmp(str, "reset")) {
reset = 1;
}
}
#endif
int lp_register(int nr, struct parport *port)
{
lp_table[nr].dev = parport_register_device(port, "lp",
lp_preempt, NULL,
lp_interrupt,
0,
(void *) &lp_table[nr]);
if (lp_table[nr].dev == NULL)
return 1;
lp_table[nr].flags |= LP_EXIST;
if (reset)
lp_reset(nr);
printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
(port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
return 0;
}
int lp_init(void)
{
unsigned int count = 0;
unsigned int i;
struct parport *port;
switch (parport_nr[0])
{
case LP_PARPORT_OFF:
return 0;
case LP_PARPORT_UNSPEC:
case LP_PARPORT_AUTO:
for (port = parport_enumerate(); port; port = port->next) {
if (parport_nr[0] == LP_PARPORT_AUTO &&
port->probe_info.class != PARPORT_CLASS_PRINTER)
continue;
if (!lp_register(count, port))
if (++count == LP_NO)
break;
}
break;
default:
for (i = 0; i < LP_NO; i++) {
for (port = parport_enumerate(); port;
port = port->next) {
if (port->number == parport_nr[i]) {
if (!lp_register(i, port))
count++;
break;
}
}
}
break;
}
if (count) {
if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
printk("lp: unable to get major %d\n", LP_MAJOR);
return -EIO;
}
} else {
printk(KERN_INFO "lp: no devices found\n");
return -ENODEV;
}
return 0;
}
#ifdef MODULE
int init_module(void)
{
if (parport[0]) {
/* The user gave some parameters. Let's see what they were. */
if (!strncmp(parport[0], "auto", 4))
parport_nr[0] = LP_PARPORT_AUTO;
else {
int n;
for (n = 0; n < LP_NO && parport[n]; n++) {
if (!strncmp(parport[n], "none", 4))
parport_nr[n] = LP_PARPORT_NONE;
else {
char *ep;
unsigned long r = simple_strtoul(parport[n], &ep, 0);
if (ep != parport[n])
parport_nr[n] = r;
else {
printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
return -ENODEV;
}
}
}
}
}
return lp_init();
}
void cleanup_module(void)
{
unsigned int offset;
unregister_chrdev(LP_MAJOR, "lp");
for (offset = 0; offset < LP_NO; offset++) {
if (lp_table[offset].dev == NULL)
continue;
parport_unregister_device(lp_table[offset].dev);
}
}
#endif
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